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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e01cc47cc5ba34d410617b6644eca73288663b7cd65dfd672889f59f7429f02d' 
  AND token = 'LI1sF2xnMAUWu7n5CuS3rjuO7gC59ASjI/lNHqU3bPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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