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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40ea8ea282134a290001900a56134f2c42ebc5a0c52a0672cb55c99e8ba228ed' 
  AND token = 'NYhu3l8sx38O/plaqz7ujOJA0bjdGeY/bm1k97LA4oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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