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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '549ad0007a255da3702344baae97effa5c884807e9bc1be4bfde0b9c6ab87990' 
  AND token = '6fhAtOp+zHVfDuwS+QiR68tSntUu5XehB9OdoFUG7fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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