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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4437007571d6ac6a43a11332db927457866949ca38f44e6300dbcc8dda8bdfe7' 
  AND token = '3Gm+CbzvX8KyubqEdi10fkisNsF6ACEQAXuxL4RDDko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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