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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90b189be0384fc4e739d7c2ebd7ed4bf88c9edabcc4935f224dea51835c89a1f' 
  AND token = 'z9rLyx/9qaDMSKY/hEKIV9DGbDv5i/8pCZNGsINdiTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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