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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '45e45677ba393f03437f130e84906c46d01b5d3ddfde4b9b78fd301a7a975ff3' 
  AND token = '6ZevUZNwHND/+OtHHZWd5YWPgH9AR9s6UvsLQgY7IWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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