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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dedb618d061694dd69bbaea0d7785dd664fa4aea1a1e4533cdc0cb823f6aef3a' 
  AND token = 'jt3fWoG/II+3xy4y3M4S3VhjHk/PcsW3k95XwgCpRxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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