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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af200fcc8973e1789b96e6224c29cb5745265ef040e074bfe7ed69fb9ef1ac62' 
  AND token = 'xsu8xwop2W+TJTodp0zM1fAdiltNGGQI2QpVI0AJA5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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