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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f475b1c36072bcc329183df36ec8baa3a436f5712cd9f7ca5dceb0890c46817' 
  AND token = 'g0WUUKZmJ6H0k8GJ8aJWCWScFemk+KdcrhwSWUPbBNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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