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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '49446dc3c0b55c25ed00c458a3c2236c1a2fb315d4cd1a2a2dacddfe0198325b' 
  AND token = 'zQxUqLMDOSd8nXlFLLxi4uBrtXM5krCR8mn9/fIMhhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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