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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8cccb7f923dc0919f43ae9ff6dcce2cc1289c7aaa00a8d22694c1f6860c0269' 
  AND token = 'PzqS1/fvplveXHoWG7BP9EXhcwCN6gLO14rx1Bw5fJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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