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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef12dee5b1c01e9d1b81b592d444400ea5c681322b0e7361c85639d8fadd07b3' 
  AND token = 'mRf9bFLOgp4raUclKMWKn5VEYc7HfLFts58wxohIAJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}