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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85a928d1b0bd410f9ea9a5175bf381aac58f29832a78181b1e6c3533581d9c53' 
  AND token = 'GduRbI2evwtLbQ/BvoE7hJ0ZhGgrp6d9FfcnHgTFNnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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