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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a2f7b8dd6128e4121d24265258a7c29e59fe78db6aac5af9497a168cd5bfbfb' 
  AND token = 'p9vFPEpcvlt/lQDEuCn8G4zxzTExHwJBdUkUWSAXbjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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