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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0b656426e49f5a015e79ab18f55bb2bbb9df09ddcea3d2ab5a13013fe10123e' 
  AND token = '7LTitw/OqE6aRS86lZEZknDVCUIyTGSkeWMWGIC9UqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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