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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5c52ea70050bd99359e94a2d921c966b74038061796ab7626c6a5880af3064f' 
  AND token = 'vQdayGhk56Bko5yQtkfA66DtbRa8sRLlXOAM9gnXddE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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