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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '638776ba734aa549daf4f07b2fc3d7b9e1bd918ef0bd0e81501bc47e00fe16e5' 
  AND token = 'lgZFbucaDpDJ97VRL6wUNE63DC4cmSPuAR+LhskQ1rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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