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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49439248598eed6c8e9ff3a3762295edac85509349846e36e88cce9aa2384edd' 
  AND token = '+2m5g1iul5bqDQwoZitefGKaXmSf7r6PCCRfHJ42Pmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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