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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbc7267108bdfc4a3635b6332a69d3a5f5ecd5aae8e22e8560fb1499ffc1ac18' 
  AND token = 'JMtkrkZlrZoFzbMOh2mEtgOwIAfOINRETGk4HHk9XB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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