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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a3f3b3654a8299cb007bd341874e9eb8135e700aac4b8ca70587fc4698f750a1' 
  AND token = 'xnGZD2mR0hVcNNlC3MZn6UAzMNpj8S62odxrHkZwLa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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