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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3c30c9ccc964258f2bce74f4bdace84551950a4d2bb29d699d71e4d8266c880' 
  AND token = 'pJsvl02YbT+5unuMrzt3b7EG5pLY7WGxaNTrv12w2pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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