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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e66f8d02dfb06a8e7470d86434af9d7e5204af0e9d267c49e8824588e67834b2' 
  AND token = '2GR+60Tax7fj8z1HHXIUSHf8p2/B2pwSn20dmI1rrvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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