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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8b06d4181e7b366a4ca0f0a27b68788ce17bfc17ad52fca0bec4970e71bd0af' 
  AND token = 'X12YwEiB6U0MSrDOWwdb4R91NFKEmKF/r5rBt+n5tF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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