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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a2352480d0e26ebcae04a073d5b35481e5b75aeeac489e39c082e49647e6698' 
  AND token = 'jEW58s8qCe6ebvI61VM1wbAcvTN36jE1o57j6N7W2rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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