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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e7434f3f1e0d49b6f01e7f1787e1010e137f8a2240e879fe09d2c4a77027c203' 
  AND token = 'UhY3dw3kceif12CgxyFWDBlchjZoRXG5YRSGI87FVrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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