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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb5b3bfb177383b0e34188fc8d427996b89da8c85ccfb90baabe4c24ad2e1e5b' 
  AND token = 'v0TtgicmxiXm2YUJ0UXq6gb0hy47J02FSqDq9pdTTA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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