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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c34c47c80abb5b8742760e943464898d7589345431241a5744c8373a5ee30e9d' 
  AND token = 'uBqMGKYUObcHdx2wlJYrz0Sd7Yr5JF6YZ21nzU1O9Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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