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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f94e6dc6186170e2bb30d9c3fbd5960dfeaafa2dea71a01e65c4670d1b647ac7' 
  AND token = '5mJ1UG7rWUwzYwPcM4TAAVgv5T6czaWeoJpSyiNY25U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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