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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c8c7638560b78a1631ac5e56bfa6ce3f3db3dd2aace6a1dc5b1e2b25bc48b9b' 
  AND token = 'qSstHYDvATBViHNmMT5bW00uwhM/Me7mxoucXyFMf7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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