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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9f8d1f1af3897e7fc2082d8cda1d7889dd72c9eece331fa5b3fff3ccada9dbf8' 
  AND token = '4CxTlzkMy2Hd3deNj3LHSGFUtWjiNRUU4jgRUkCp/40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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