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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4096028a845769a5429c605db217c1e27ffacbc5ff04f6ccb028217317ef64f0' 
  AND token = 'n2ae6YdTNdw/Yag2dzs/W3A+u524AugrK4EP+IRPfTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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