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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9324e2571aabb3db74402be790f6400b247fb7a924e7a65c18e73927f619d023' 
  AND token = 'qVmVzxnTSHgRbrgxCD2cEks2OM/MDe5PM2mc4OGATew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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