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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e2e0f5c72dd99e01de4bb42dfe28ac7788b6fbbd4caa85a598effcee99fa8bd' 
  AND token = 'sn/I4dTnZHKc6xCd+wqWcOXUcChEpVLWVcZzGtq05xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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