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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6776d30a6d75d980af30f63541f832f2d93d2a6684013337b348cf6d4ac492e8' 
  AND token = 'xHb24sdMeZoOfFtMeUsS+dshERT4Qv/a65+q23/BIv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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