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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72dcdd4348ee9682c625ca1ef988160de50568503e650ef80c4a3fec08286e66' 
  AND token = 'upxbeNLH6XEFwdVYIwfxC97q6kJF0Q+eGkAtiqfR+5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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