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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f0ff348ea80c09b8b3e108ead7a740ed718cb2ffa9c1cd5ac3e90ba8677640f' 
  AND token = 'kfnWGDbKxP/0p1jGPksY9M2P1zB9h+I/BAwWc9SRxUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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