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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '321365ad9c92a615e9a29c106f9e87053d4c7b9ce2f97e0fe366550ba2d78d33' 
  AND token = '5pfn2stvi7iafEChcL54kakHjiqWIHKaupTm+SlVd1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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