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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0904920e9a556bf66108fc6cf2aaad52a1ea4ef6105efc116b40ae80ee86ccc' 
  AND token = '9T7ks9StoolYgW4zWWi5HhQJoLYeeu6rRh+tLvWVjzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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