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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66d7785725887da6c14804a333e0828f8cf7d63e1c53633d1ac5c6cf10537fee' 
  AND token = 'SJyk6R9Ni1onu7NQpxPyWUwIFgJg7TZsHHCeQnYYq9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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