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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e438ba4efdd2a10a47e1ee5ba6991823cf3340102f0429ad72105d0874c564ac' 
  AND token = 'HZBrH2LaY4eDVcIPyHtuEOgnXTVmZ4awQfMrYR2ai60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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