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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85a2c21a06ae6822d676afc17d919d87e5a02cc8510ca00d9f08f6392fd537d8' 
  AND token = 'vv+dByaOyJeuejSPelYGOMJttX9zbgzfUCtfxWKExsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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