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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c26b964872321b6d544e8e4f409723405124858f38273745cf4c095aeb8cdf51' 
  AND token = 's9piVuOfIFlFXnKxn5srO5ZZDZYIV5kaNm5kZmSna8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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