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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dec516092a8024cf8dbd7e72b5d9109e5dcc6fc062b3552f5ee542cc626ce064' 
  AND token = 'aTSFSvk6bnDrK414lTaKKzas5MNdbfcX0G5yN9CMLBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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