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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '704f2a34f5982804b35926ee69667b3c0f99483dafe715e2bf52bc77b9c61595' 
  AND token = 'LrdoE86zmpDjUjTKOQZcSU5jU4A/3mcEpYf1PWcYuR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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