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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca02689e1a59fb96c3d5c0942c848c27931f2781b158447d77bc615f97989e2f' 
  AND token = 'fsMi8pPjeFL7m5AlqodTC1lgwlPTIUS1tuKi07YL+xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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