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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6eda8e578b995602a68927f20ed836b15672a1a698b622ebee89a9cd25521ad6' 
  AND token = '8m8OH25TWw/l06dKRB4zNDqZQT4LxQCkFygVbWyuoYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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