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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8556d06c679b2821df9a53e844d2d155c4e8c79693fc259e769ee97b58fedb60' 
  AND token = 'BOq9+AuOAopzaIGuzFbETHnTWRJ85WFEDb61nMEXKg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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