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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9937a5937b050f651967322c8957cf64809c487fad5da9ab29cf51315b7a989b' 
  AND token = 'h89LNZspUazFzRjBrcmzSW7ti+d6dw5c6mi1XiAtFGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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