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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7ee5b5fcc72da96c3b54bc403bef6c4638b0790bd7bf0d1af7635ccb45ff147' 
  AND token = '67lt1sIOQvDGH41KD+y/P5UEJCPefjQPccK5sqAhUGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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