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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a70c8c4cc2ba2cf5297ebc2d471f5d61261cabb4e38c1a55a017494ec74cc25f' 
  AND token = 'kAQW0wwt8T8Lk6DtAbLBDuyoD1jyx5Ud8OE1YZ5qCTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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