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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cda4a83302a4c32bdf2cb7ab1512e9b23573602f68e28bebbe5b41b379ceb66b' 
  AND token = 'l2h5B38vtZTX8O9xWh/e5X+akT4NJBwb+2OPzFI2miE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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