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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3197838f30fbcb18b57a6d43d9767d3c28688faef4d62c54bbf80dfb701f8bb0' 
  AND token = 'XxvOfIMBgRAu9ex9X95V+nsy80ItZma6N1WQTpvP354=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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