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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39e839798af663a037398b3028935b79701ce8acfa8e14630c8ef6517a60b690' 
  AND token = 'lm6xxqN1h+3WUjETEDazrglyn1/S8i9iRL9EgKnrMYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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