SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e4feda0a24a3091dd1fdf1ed82d1731b0e9613378c352914ce193b6e6df8b83f' 
  AND token = 'SYzcYWz+rhsKWADJWHM+W/1piqX+jXhIG5Oj7XY7NU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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