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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '24866e4e73ce09f4d83d2b6277605dbdcc86ee62956b73f49e9ba6b797c8df96' 
  AND token = 'He8ZTSZW9GtpZDZPrPQnc9A7jI2GVfTjp4Pc3a5FQpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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