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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b190d6f4b9b89a84c9f63f0891ca98f1d942017458a91e3aaed342dc17420e6' 
  AND token = 'mWTXcjUg2Ov0NnSRP1sJXtHlx9lzZIj2CohVR4T0ET0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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