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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f796c4c03550ba9c4607e6e7999052d7dd43875dd9557f48313cbd39a90aad69' 
  AND token = 'G8rmSpCXMNpsOH8Khzsv45sPAQTlp2pvnu4g9gt8cqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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