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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfc1c024b4e8dbba4e19531bb08993d8d94d2e6a9b861d3186323398497a005f' 
  AND token = 'xW0HkYhZi8k14ZjPicIvbOuB7tB210ylzNmRBnMoBXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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