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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd6c3849b9a8b8c68ee03aa9e43c4c89cedde37cd5f017d261d6e375ca2fd71d' 
  AND token = 'gGUV9vAUOmz4eQzCM5h8uHsa84ftWb5S8A/u56D7WhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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