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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e91d7592f3d9e94cc75bdd28d73c1dcfc9b93898215dca20efe5303945ebc7e' 
  AND token = 'm3zkU7rFGLzdIas/Lm1cRTBTtGJW/Gl6MV83BoKKDZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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