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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b17b16b20faed9441a75b699bab7c8424c0eeacdc5dde7f166e853d9feed664a' 
  AND token = 'gALiMRj/14CRZHdL9ruTGnIlbB9i8MVM4ju6uuFTias=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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