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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a940244ee1452f325aa8f502ebbc260a50f0cb3cc69d3d96c3567951786b504' 
  AND token = 'NDPcU8HMHUBNeECXszayXzvoJeU4klwzv8C7ngY0pXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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