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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a416e5c4c806e6ca2cd04735be86477c432086041a403fd5c9689c701f698d5' 
  AND token = 'iMD221KsVGzGy5TPJo2WhThz3MTx2Px3TL/3MWJ1/D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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