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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f660bb736f1d900978d0748a4334a6d53d003d22c03fe918a9aec092512ca806' 
  AND token = 'CVGSnrbOzhYKh02RmQyViCon1IBWG1afs8y4aszVJz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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