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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26c20d527c57c67ed73eb679b196e0d0530c90f90d8c0df43cbf25582a6e1056' 
  AND token = 'V5hWldLgkPAkluvV/Ovv0Bg2zGg7o/zlBFcIvSTHugg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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