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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c74938e9f516dad8f11aafb940d074afc8ac7cf97dd1f5bec9c7c4a86946f1b0' 
  AND token = 'P53WJ1RUAj3DrQS0yy2Yqz2HKzltubqyJkBCJ1Wis2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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