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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a8d05c9f53e70ec0705d011cbe27f5a1c7ef17a05da9ef28e4d86ddd0794402' 
  AND token = '0JXroSCIOu4ANPcl5s3tTUR0UuRLJQndqSGYc7Pw5eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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