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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe2cab879154e1fadcb5c58ea19b7cbc7387a898b17df22d85cfdaf9011dc48f' 
  AND token = 'TcWFiYkx4QfOazW53eMTxFkXG1Xy7auBU5StUvH9KgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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