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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1de0716138134a0efe21c7265e3957c1c8625b4b52276ba434b440c1cf98f1f' 
  AND token = 'ZK811mf7lzD9aSkDVdGtReWoeR+FiRIOqHoAfIvo+RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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