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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '323336d941222ed154f8133236119f261c5d7f0b9c41ed0b18abf537426b145d' 
  AND token = 'uut9a0hq7eBwsY94qcIo09Lh6LMdoBPfrla06womk4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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