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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d5b2bd233ccdb6ecd2d9adcfd4ba79af8766782bb88f028e36b4f0fe19e26b3' 
  AND token = 'kEzMyfprvdvB4GA4gWx3UO10SWxte59C2jc3GZ8REa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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